1.

Number of ways of selecting 4 shoes from 10 pairs such that exactly onee correct pair is selected is

Answer»

` .^(10)C_(1) .^(9)C_(2).2^(3)`
` .^(10)C_(1)xx9xx16`
`(( .^(10)C_(1).^(4)P_(2).18xx16)/(4!))`
`10xx18xx16`

Solution :NUMBER of WAYS of selecting 1 pair from 10 pair is ` .^(10)C_(1)` number of ways of selecting 2 shoes from 18 shoes such that both are DIFFERENT is `(18xx16)/(2)`


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